WATCH: Carrie Fisher and Debbie Reynolds’ Bond Explored in First Trailer for Their HBO Documentary

The trailer for HBO’s highly anticipated documentary about the relationship between the late Carrie Fisher and Debbie Reynolds is here — and PEOPLE has a first look. Fisher, 60, was aboard an 11-hour flight from London to Los Angeles on Friday when she went into cardiac arrest. She died Tuesday in the hospital.

Reynolds died a day later at the age of 84.

Bright Lights: Starring Carrie Fisher and Debbie Reynolds will debut Jan. 7 (at 8 p.m. EST) on HBO.